Complete-combustion apparatus for marine boilers



.May 5, 1925 T. SAT 4 COMPLETE COMBUSTION APPARATUS FOR MARINE BOILERSFiled Jan. 6, 1922 Patented May 5, i925. y

` Niirursn srAriss essere COMPLETE-COM'BUSTION APPARATUS MARINE BOILERS.

Application led January 6, 1922. Serial No. 527,512.

To all whom it `11mg/ conce/1%.'

Bc it known that l, '.lfonUsAeUno Saro, a subject of the Emperor ofJapan, and a resident of No. 1061 Tamade-Machi, Nishinari-Grun, Osaka,lihnpire of Japan, have inventednew and useful Improvements inComplete-Combustion Apparatus for l/larine Boilers, of which thefollowing is a specification.

This invention relates to combustion apparatus for marine boiler inwhich a refractory wall is secured on a nre bridge in inti mate relationwith the flue plate and is provided with an air duct in the mass of saidwall which duet is opened to an internal flame passage of the wall ateach side for discharging the. hot air, preferably, intensivcly heatedair therefrom, sucked in from the underside of the vlire bridge, saidwall also being extended to form a conical shaped flame guidel having asharp edge at rear end thereof.

This invention has for its purpose to provide a means `to makeeconomically complete combustion of fuel in a simple and efficientmanner.

My invention will be readily understood by reference to accompanyingdrawing, in which:

Fig. l. is a longitudinal vertical sectional view of a marine boilerprovided with my invention,

Figfi is a cross sectional view of Fig. l,

Fig. 3 is an enlarged longitudinal sectional detail view of myinvention, and

Fig. ll: is a cross section thereof, halfly being omitted.

Referring to the drawing, (l) is a marine boiler proper, (2) representsthe smoke tubes and (Il) is a lire bridge on which the rear end of thetire grate ($5) is supported.

ln the flue and on the lire bridge,` a refractory wall secured inintimate relation therewith, which has a flue opening, the rear end ofwhich is contracted to form a flame guide (G) around the circumferenceof which is a sharp edge as shown. (7) is lire bridge supporting frame.ln the lower side of said lire bridge is a vent hole (8) in which theair is sucked from the ash pit below the grate and is conducted to airducts (0) provided in the mass of the refractory wall itself. The duct 9is also opened to the internal flame passage or flue opening of the wallat the ends as at" .combustion without smoke.` `In the fame (7), an airregulating box or damper (ll) which is open at the top is slidablymounted for regulating the quantity of air passing through the box byany appropriate means, say, by a handle (l2) attached to said box.

In this invention, the refractory wall is heated by flame gas from thefire box while the air sucked in from the underside of the fire bridgethrough the vent hole (8) and the air regulating means (11)- becomesbrightly heated during its passage through the ducts 9 of said heatedwall and is discharged through the jet hole (l0) at each side, into theflue opening or flame guide 6. Then, the flame gas is prevented Vfromcooling down up to the ignition temperature of the carbon monoxide.rl`he flame is also prevented from directly rising up from the passageto the smoke tube (2) by means of the flame guide (6), thus making amixture of the incompletely burned gas and oxygen and providing agreatly promoted combustion. The flame guide (6) is extended, as shown,to form sharp edge which, being extensively heated, serves to highlyheat the mixture with the carbon monoxide and oxygen.

My invention is provided to regulate the quantity of the heated air byadjusting the regulating box.

Having now described and ascertained the nature of this invention and inwhat manner the same is to be performed, I vdeclare that what I claim isuIn a furnace, a [ire box, an ash pit, a bridge wall in rear of theashpit and lire box and having an opening extending rearv wardl y from thefire box, and a combustion chamber into which saidopening discharges,the said bridge wall having on its rear side a flange which dependstherefrom and also presents afrusto-conical inner side forming acontraction of the rear end of said opening, the said bridge wall alsohaving a hot air intake opening leading from the ash pit and aductleading from said hot air intake opening formed in the mass of thebridge wall and discharging into one side 0f the first named openingtherein and a frame supporting said bridge Wall and against the rearside of which the said depending ange of the re Wall bears, said frameand flange also having an opening to establish direct Communicationbetween the ash pit and the Combustion chamber, and means to control thepassage of air through said opening and

